2015-4-14 Study notes: Contact management

One, add a new line

0. Remove the last child control

UIView *last = [Self.view.subviews lastobject];

New Y for this line = Last child control y + height of last child control

CGFloat rowy = last.frame.origin.y + lat.frame.size.height + 1; 1 for Line spacing

1. Create a row

UIView *rowview = [[UIView alloc] Initwithframe:cgrectmake (0, Rowy, 320, 50)];

* Equivalent to the following two lines

UIView *rowview = [[UIView alloc] init];

Rowview.frame = CGRectMake (0, Rowy, 320, 50);

Rowview.backgroundcolor = [Uicolor Redcolor]; Set Background color red

2. Add a row to the view in the controller

[Self.view Addsubview:rowview];

3. Make Delete Item valid

_removeitem.enabled = YES;

4. Performing animations

Rowview.frame = CGRectMake (Rowy, 320, 50);

Rowview.alpha = 0; Default transparency

4.1 Start animation

[UIView Beginanimations:nil Context:nil];

[UIView setanimationduration:1.0];

Rowview.frame = CGRectMake (0, Rowy, 320, 50);

Rowview.alpha = 1; Transparency changed to 1

[UIView commitanimations];

* Equivalent to the following animation block usage

[UIView animationwithduration:1.0 animation:∧{

Rowview.frame = CGRectMake (0, Rowy, 320, 50);

Rowview.alpha = 1; Transparency changed to 1

}];

Second, delete the last line

1. Remove the last child control

UIView *last = [Self.view.subviews lastobject];

Determines the property of the last class, which is toolbar return

Class C = [Uitoolbar class];

if ([last iskindofclass:c]) return;

2 Removing a child control

[Last Removefromsuperview];

[UIView animationwithduration:1.0 animations:∧{

CGRect Tempf = last.frame;

Tempf.origin.x = 320;

Last.frame = Tempf;

Last.alpha = 0;

} completion:∧ (BOOL finished) {

[Last Removefromsuperview];

_removeitem.enabled = Self.view.subviews.count >1;

}]

3. Determine the number of remaining child controls

if (Self.view.subviews.count = = 1)

{

_removeitem.enabled = No;

}

* Equivalent to the following line

_removeitem.enabled = Self.view.subviews.count >1;

2015-4-14 Study notes: Contact management